There are a vast number of materials available for roofing from timber shingles, natural slate, thatching to metal. The choice is down to you, your budget and your exterior design plan.
For those concerned about the environment, reducing your carbon footprint is also a major consideration. Therefore we suggest that you look carefully into your materials and where you can source them. We would also suggest you consider a synthetic or organic underlay. Carefully selecting your materials and picking the right ones could lead to you becoming LEED certified (Leadership in Energy & Environmental Design).
Depending on your location, taking into consideration your carbon footprint will start to limit the materials available.
If your heart is set on metal and you can obtain metal materials you have a few options:
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Steel is the most common; however it must be coated to stop it from rusting.
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Copper is an expensive option and will also “age” due to it being oxidised over time. This means that it will change over time from a penny red to a blue/green, so this is something to consider.